A woman has spoken of the moment she saw a teenager who was stabbed to death in Hayes lying on the street covered in blood.
The woman said she witnessed the assault unfold in Gledwood Gardens, Hayes , on Monday (August 15) afternoon and screamed at his attacker to stop.
An 18-year-old died at the scene and a man, also 18, remains in police custody after being arrested nearby on suspicion of attempted murder.
The witness, who did not want to be named, said: "The boy (who had been stabbed) had his shirt off and he was covered in blood."
She said the street had been completely empty at the time but her screams brought residents out of their houses.
"By then, people had heard my screams and thought something happened to me and they came out. A woman was standing over the boy and other people had come to help," she said.
'I did what I did as a motherly instinct'
"I was also thinking as a mother. I did what I did as a motherly instinct as well, if the boy had run towards me I would have let him in my house, but I don't know if that would have been the right thing or not.
"You would do anything to protect someone when they're in trouble."
The victim was found shortly before 4pm by paramedics and despite their efforts to save him was pronounced dead at the scene abut half an hour later.
The Met Police say they believe the victim had been initially attacked at an address in Gledwood Gardens.
They have asked anyone with information to call the incident room on 020 8785 8099.
To remain anonymous, contact Crimestoppers on on 0800 555111 or via crimestoppers-uk.org.